(STRUCTURAL CONCRETE).

Transcription

1 S-1 REVISED SCHEDULE OF MATERIALS CONTROL FOR CERTIFIED READY-MIX CONCRETE PLANT PRODUCTION NEW WRITE-UP 02/11/19 DO NOT REMOVE THIS NEW WRITE-UP DATE. IT NEEDS TO STAY IN FOR THE CONTRACTORS. Always use this write-up with SP (STRUCTURAL CONCRETE). SP S-1.1 Pages of the MnDOT SD-15 June, 2017 (Rev. Nov., 2017) Schedule of Materials Control for 2018 Standard Specifications shall be deleted and replaced with the following:

2 IV. Concrete Construction Items (cont.) ( Certified Ready-Mix - Concrete Plant Production Remarks: (1) All gradation and quality tests require companion samples. Samples taken at location identified on Contact Report located. (2) Perform Aggregate Quality testing as directed by the Concrete Engineer. (3) When <20 yd 3 of concrete is produced in a week, plant monitoring is not required with the exception of monthly aggregate quality testing. Minimum Sample Sizes: Gradation: 3/4 Plus, #4: 30 lb. 3/4 Minus, #67: 10 lb. #7, CA-70: 6 lb. CIA, FIA: 1000 g CS, FS: 500 g #89, CA-80: 500 g Fine Aggregate: 500 g Companion Required, Double Sample Sizes Pay Item 2301** Moisture: Fine Aggregate: Intermediate Aggregate: Coarse Aggregate: 500 g 500 g 2000 g Aggregate Quality: 3/4 Plus, #4: 50 lb. 3/4 Minus, #67: 30 lb. #7, CA-70: 30 lb. #89, CA-80: 30 lb. Intermediate Agg: 30 lb. Fine Aggregate: 30 lb. Companion Required, Double Sample Sizes Test Type Spec. Producer/Contractor Testing Agency Testing Form Gradation (QC/QA) All JMFs and Bridge Deck mix designs Daily Concrete Quantity: yd 3 : 1 per fraction per source >400 yd 3 : 2 per fraction per source Take second gradation after daily total exceeds 400 yd 3. Passing aggregate gradations are required prior to the start of bridge deck pours. All other mix designs Weekly Concrete Quantity: yd 3 : 1 per fraction per source >400 yd 3 : 2 per fraction per source Take second gradation after weekly total exceeds 400 yd 3. Notes: Washing the fine aggregate gradation (QC) sample is not required when the result on the -#200 sieve of the unwashed sample is less than 1.0%. Hold QA (QC companion) samples until they are picked up by the Agency monitor. Discard after 14 calendar days. Performing testing on representative material at the end of the most recent day of production is allowed. All mix designs Weekly Concrete Quantity 20 yd 3 : 1 QA (QC Companion) sample per fraction per source per week Include QC Companion results on Sample ID Card. QC Workbook Aggregate Gradation Control Charts Workbook

3 IV. Concrete Construction Items (cont.) ( Certified Ready-Mix - Concrete Plant Production (cont.) Pay Item 2301** Test Type Gradation (Verification/ Verification Companion) Aggregate Quality including Coarse Aggregate Percent Passing - #200 Aggregate Moisture (QC) Spec Producer/Contractor Testing Agency Testing Form Test the Verification Companion sample. Complete on the day the sample was taken. Wash all fine aggregate Verification Companion samples. Test at Contractor s Discretion 2461 Daily Concrete Quantity 20 yd 3 : 1 per fraction per source completed every 4 hours. Complete the initial moisture content and adjust the batch water prior to the start of concrete production each day. If weather conditions allow, performing moisture testing on representative material at the end of production the prior evening is allowed. In this event, the four-hour rate will commence with the first pour of the day, regardless if it is placed in Agency or private work. Weekly Concrete Quantity 100 yd 3 : 1 per fraction per source Include Verification Companion results on Sample ID Card. 1 per fraction per source per month. Bridge Deck Concrete: 1 per fraction per source per month tested for D.2 Identify quality samples with a Q on the Sample ID Card and the Quality companion sample. None QC Workbook Weekly Certified Ready-Mix Plant Report or QA Workbook 2410 Sample ID Card QC Workbook

4 IV. Concrete Construction Items (cont.) ( Concrete Pavement - Concrete Plant Production Remarks: (1) Use Certified Ready-Mix - Concrete Plant Production testing rates schedule when: a) The entire concrete paving project is < 3,500 cu. yd. b) A secondary plant is used to provide minor work. (2) When w/c incentives apply: a) Contractor QC Technician and Agency Plant Monitor are required to be present during the entire pour. If w/c incentives do not apply, the Agency Plant Monitor shall monitor as necessary to ensure compliance with the requirements of the Contract. b) A certified ready-mix plant shall be dedicated (provides concrete only to the concrete paving project). (3) Take gradation samples in the presence of the Agency unless otherwise authorized by the Engineer. Take samples off the belt leading to the weigh hopper unless otherwise approved by the Engineer. All gradation and quality tests require companion samples. (4) Perform Quality testing as directed by the Concrete Engineer. Minimum Sample Sizes: Gradation: 3/4 Plus, #4: 30 lb. 3/4 Minus, #67: 10 lb. #7, CA-70: 6 lb. CIA, FIA: 1000 g CS, FS: 500 g #89, CA-80: 500 g Fine Aggregate: 500 g Companion Required, Double Sample Sizes Moisture: Fine Aggregate: Intermediate Aggregate: Coarse Aggregate: 500 g 500 g 2000 g Aggregate Quality: 3/4 Plus, #4: 50 lb. 3/4 Minus, #67: 30 lb. #7, CA-70: 30 lb. #89, CA-80: 30 lb. Intermediate Agg: 30 lb. Fine Aggregate: 30 lb. Companion Required, Double Sample Sizes -#200 Coarse Aggregate: 3/4 Plus, #4: 12 lb. 3/4 Minus, #67: 6 lb. #7, CA-70: 6 lb. CIA, FIA: 1000 g CS, FS: 500 g #89, CA-80: 500 g Pay Item Test Type Spec. Producer/Contractor Testing Agency Testing Form 2301 Gradation (QC/QA) Concrete paving batch plant: Daily Concrete Quantity 250 yd 3 : 1 per 2500 yd 3 per fraction per source Take initial samples for aggregate gradation testing within the first 250 yd 3. Certified ready-mix plant: Daily Concrete Quantity: yd 3 : 1 per fraction per source >400 yd 3 : 2 per fraction per source Take second gradation after daily total exceeds 400 yd 3. Concrete paving batch plant: Daily Concrete Quantity 100 yd 3 : 1 QA (QC Companion) sample per fraction per source per week Certified ready-mix plant: Weekly Concrete Quantity 20 yd 3 : 1 QA (QC Companion) sample per fraction per source per week JMF Concrete Aggregate Workbook JMF Moving Average Summary Workbook 2410 Sample ID

5 Performing testing on representative material at the end of the most recent day of production is allowed. If well-graded aggregate incentives apply: Use the Contractor s gradation results for well-graded aggregate incentive calculations as verified by Agency testing Include the JMF Number and the QC Gradation/Verification Companion results on the Sample ID Card. Card when samples are submitted to MnDOT Laboratory 2301 Gradation (Verification/ Verification Companion) Test the Verification Companion sample. Complete on the day the sample was taken. Concrete paving batch plant: Daily Concrete Quantity 250 yd 3 : Certified ready-mix plant: Weekly Concrete Quantity 100 yd 3 : 1 per fraction per source per day If well-graded aggregate incentives apply: 1 per fraction per source per day If well-graded aggregate incentives do not apply: 1 per fraction per source per week Include the JMF Number and the QC Gradation/ Verification Companion results on the Sample ID Card. If Coarse Aggregate Quality Incentive/Disincentives apply: The Agency may use the Verification gradation sample for the Coarse Aggregate Quality incentive/disincentive testing.

6 S-1.2 The following shall be added to the bottom of the Table on Page 35 of the MnDOT SD-15 June, 2017 (Rev. Nov., 2017) Schedule of Materials Control for 2018 Standard Specifications:

7 IV Concrete Construction Items (cont.) ( Colored Concrete Membrane Curing Compound 3752 Visual Inspection Only curing compound for colored concrete from qualified sources is allowed. Refer to the approved products list of curing compounds for qualified manufacturers

8 S-1.3 Page 39 of the MnDOT SD-15 June, 2017 (Rev. Nov., 2017) Schedule of Materials Control for 2018 Standard Specifications shall be deleted and replaced with the following:

9 IV. Concrete Construction Items (cont.) ( Concrete Field Testing Concrete Pavement (cont.) Pay Item Test Type Spec. Contractor Testing Agency Testing Form 2301 Concrete Pavement Texture 2301 Perform texture testing at locations determined by the Engineer in accordance with the Contract. Determine texture testing locations using random numbers. Observe Contractor testing when possible. Probing Coring Texture and MIT- SCAN T2 Report 2301 Thickness (QC/Verification) 2301 Surface Smoothness 2301 Dowel Bar and Tie Bar Steel Location 2301 Probe and core at locations determined by the Engineer in accordance with the Contract Measure smoothness of the final concrete as required by the Contract. Perform all profiling in the presence of the Engineer unless otherwise approved by the Engineer For concrete projects greater than 3,500 cu. yd. On the first day and each day of slip form pavement placement: (1) Verify the adequacy of the dowel bar anchoring by scanning seven (7) random doweled contraction joints in each sublot. (2) Verify the presence and alignment of tie bar steel by scanning 75 lin. ft. in each sublot. If the Engineer determines the first days dowel bar anchoring and tie bar placement processes are acceptable, the Engineer may allow a reduction in scanned joints in each sublot as follows: (1) Verify the adequacy of the dowel bar anchoring by scanning four (4) random doweled contraction joints per sublot. (2) Verify the presence and alignment of tie bar steel by scanning 25 lin. ft. out of every sublot. Initial pavement at core locations and reinitial the sides of specimens after coring. Field measure to the nearest 1/8 Transport to the MnDOT Office of Materials and Road Research for final thickness determination. Observe Contractor testing when possible. Observe Contractor steel location testing when possible. Probing Coring Texture and MIT- SCAN T2 Report Field Probing Report Field Coring Report Concrete Profile Summary Worksheet Probing Coring Texture and MIT- SCAN T2 Report

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